# A012755 (b-file synthesized from sequence entry) 0 0 1 2 2 0 3 400 4 2688 5 1631488 6 60938240 7 35243972608 8 3826154307584 9 2477263324839936 10 571708399442198528 11 435722170330996801536 12 177081722613295659089920 13 162107313371111569999527936